1 Department of Pediatrics, Section of Infectious Diseases, University of Colorado School of Medicine, Aurora, CO, USA; Children's Hospital Colorado Aurora, CO 80045, USA. Electronic address: kevin.messacar@childrenscolorado.org.
2 Department of Ecology and Evolutionary Biology, Princeton University, Princeton, NJ, USA.
3 Department of Pediatrics, Section of Infectious Diseases, University of Colorado School of Medicine, Aurora, CO, USA.
4 Department of Pediatrics, Section of Infectious Diseases, University of Colorado School of Medicine, Aurora, CO, USA; Children's Hospital Colorado Aurora, CO 80045, USA.
5 Department of Ecology and Evolutionary Biology, Princeton University, Princeton, NJ, USA; Princeton School of Public and International Affairs, Princeton University, Princeton, NJ, USA.